Google released version 2.0 of its Authenticator app earlier today, only to pull it from the App Store as users complain that it erased existing stored data and connected accounts.
Within hours of the app's release, reviewers reported that it had erased tokens on the iPhones for apps like Dropbox, GoogleApps, Dreamhost, Twilio and Evernote. In some instances, those users found themselves locked out of their apps until they contacted support for each one.
Two-step authentication is becoming the standard for password security, and we're sure Google is working on a fix now. When it's back in the store, we'll let you know.